Sexual reproduction

A. maintained the same gene combinations over time.
B. helped maintain a slow rate of evolutionary change.
C. increased genetic variation.
D. limited the material in which natural selection can act upon.

Sexual reproduction is a form of reproduction where two gametes fuse together. Each gamete contains half the number of chromosomes of normal cells. They are created by a specialized type of cell division, which only occurs in eukaryotic cells, known as meiosis.

So i'm gonna say that the answer is..B. helped maintain a slow rate of evolutionary change.